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Optocoupler Input-Output Endurance Voltage - App Note
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Optocoupler Input-Output Endurance Voltage - App Note
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From Avago Technologies Limited
A major concern of circuit designers is the reliability of an optocoupler when subjected to repeated and long-term, high-voltage stress between its input and output. Most of the technical data on optocouplers adequately address the capability of an optocoupler to withstand one-time high-voltage transients, but they do not adequately address the issues of:
a) how long one can apply a steady state ac or dc voltage between the input and output of the optocoupler before degrading the semiconductors or the insulation inside the optocoupler, and
b) how often one can apply high-voltage transients before degrading the optocoupler.
In attempting to answer these questions, a series of operating life tests were conducted on Hewlett-Packard (HP) optocouplers. Several optocoupler lots were subjected to different input-output high-voltage stress tests to examine the failure rate and the time taken to fail. Upon completion of these tests, the test data was analyzed to create safe operating areas for long-term, input-output high-voltage stress. The boundary of the safe operating areas for the steady-state input-output high-voltage stress is referred to as Endurance Voltage.
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